the buff looks like a rooster to me a little bit
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It all depends on the breed. My first layer was a gold star and a little over 17 weeks. My EE's, on the other hand, layed at about 6 1/2 months. (They are known to be late bloomers.)18 weeks? I thought eggs were not around until the chickens were 20-24 weeks old. We are new to this with 8 chickens and they are 12 weeks old now. 2 are roosters. I have read that if you have some dominant roosters, then the less dominant ones won't really show themselves until/unless the dominant one is removed (somehow, freezer camp or dumplings).